This research examines the effectiveness of six non-chromate conversion coatings on aluminum armor alloys 5083,7039 and 2519. Evaluation included salt fog, cyclic salt spray, wet adhesion, and electrochemical impedance spectroscopy on both painted and unpainted test panels. Large differences in behavior were noted between the salt fog data obtained on unpainted panels and the cyclic salt spray data obtained on painted and scribed panels. How this data will affect the implementation of non-chromate pretreatments within the US Army is discussed. Additionally, these findings provide guidance for continued development of non-chromate conversion coatings and their eventual performance standards.

Subject
Test methods, Primers, Electrochemical impedance spectroscopy, Coating performance, Top coats, Materials performance, Impedance, Pretreatment, Salt spray corrosion testing, Corrosion resistance, Blistering, Alloys, Chemical conversion coatings
Keywords:
non-chromate, chromate, aluminum, armor, impedance, salt fog, cyclic salt spray
© 1997 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1997
Association for Materials Protection and Performance (AMPP)
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